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Title: Nodal gap structure and order parameter symmetry of the unconventional superconductor UPt₃

Spanning a broad range of physical systems, complex symmetry breaking is widely recognized as a hallmark of competing interactions. This is exemplified in superfluid ³He which has multiple thermodynamic phases with spin and orbital quantum numbers S = 1 and L = 1, that emerge on cooling from a nearly ferromagnetic Fermi liquid. The heavy fermion compound UPt₃ exhibits similar behavior clearly manifest in its multiple superconducting phases. However, consensus as to its order parameter symmetry has remained elusive. Our small angle neutron scattering measurements indicate a linear temperature dependence of the London penetration depth characteristic of nodal structure of the order parameter. Our theoretical analysis is consistent with assignment of its symmetry to an L = 3 odd parity state for which one of the three thermodynamic phases in non-zero magnetic field is chiral.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [7] ;  [7] ;  [7]
  1. Northwestern Univ., Evanston, IL (United States); Stony Brook Univ., Stony Brook, NY (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Univ. of Notre Dame, Notre Dame, IN (United States)
  4. Univ. of Notre Dame, Notre Dame, IN (United States); Univ. of California, Santa Barbara, CA (United States)
  5. Loyola Univ. Chicago, IL (United States); Univ. of Illinois Urbana-Champaign, Urbana, IL (United States)
  6. Montana State Univ., Bozeman, MT (United States)
  7. Paul Scherrer Inst., Villigen (Switzerland)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
FG02-05ER46248; FG02-10ER46783
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 2; Journal ID: ISSN 1367-2630
IOP Publishing
Research Org:
Northwestern Univ., Evanston, IL (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; heavy fermion; superconductivity; SANS; UPt₃